We have never been able to get this to work.  When I try to scan to an email address I get the message on the screen "SMTP error 016-053"

People print to it fine.  It makes copies just fine.  I can get to it and change settings with a web browser.  I have other Toshiba printers that can scan and send email using SMTP just fine.

I know the email and password is right.  The 587 port and "smtp.mail.." string is the same as the Toshiba.

Any ideas, or what else can I do to test what the problem is?
What does error 016-053 mean?
What is the difference between the different E-Mail Send Authentication methods ie "SMTP AUTH (Login)"

E-Mail Server Settings

Primary SMTP Gateway SMTP Port Number (25, 587, 5000 ~ 65535) E-Mail Send Authentication InvalidPOP before SMTP (Plain)POP before SMTP (APOP)SMTP AUTH (Plain)*SMTP AUTH (Login)SMTP AUTH (CRAM-MD5)SMTP AUTH (AUTO) SMTP Login User Verified SMTP Login Password Verified Re-enter SMTP Login Password Verified POP3 Server Address POP3 Port Number (110, 5000 ~ 65535) POP User Name POP User Password Re-enter POP User Password Reply Address Verified (Sent with every E-Mail) SMTP Server Connection Unable to connect